package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号是否合理
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不合理，返回错误信息
            return Result.fail("手机号不合理");
        }
        //3.合理，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功：{ }"+code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.检验手机号是否合理
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不合理，返回错误信息
            return Result.fail("手机号不合理");
        }
        //3.校验验证码
        String cachedCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if (cachedCode==null||!code.equals(cachedCode)){
            //4.如果失败返回错误信息
          return Result.fail("验证码错误");
        }
        //5.查询用户是否存在
        User user = query().eq("phone", phone).one();
        //6.不存在，注册新用户
        if (user==null){
            user=createUserWithPhone(phone);
        }
        //7.将用户信息存入redis
        //7.1 生成token
        String token= UUID.randomUUID().toString(true);
        //7.2 将类转换未map
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),CopyOptions.create()
                .setIgnoreNullValue(true).setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3 将map存入redis
        String userToken=LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(userToken,userMap);
        //7.4 设置过期时间
        stringRedisTemplate.expire(userToken,LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
